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Iron is the most widely used of all the metals, accounting for over 90 of worldwide metal production. Its low cost and high strength often make it the material of choice material to withstand stress or transmit forces, such as the construction of machinery and machine tools, rails, automobiles, ship hulls, concrete reinforcing bars, and the load carrying framework of buildings. Since pure iron is quite soft, it ismonly combined with alloying elements to make steel.
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